Ms King was giving evidence at the inquest at Auckland Coroners' Court into the death of her twins, Cru and Chris Kahui, in June 2006.
She has given evidence that she was with her sister, Emily, on the afternoon and evening of June 12, 2006, when police say the fatal injuries to the twins happened.
The pair had gone to visit a friend of Emily's in west Auckland before returning to Emily's Papakura home, where Ms King slept the night.
She said she was told by her sister when waking about 7am that baby Cru had held his breath the previous night, causing Mr Kahui's sister and brother to seek her out at the Papakura address.
But instead of rushing back to the home, she stayed at Emily's home and then dropped her sister off at work in Mt Wellington before returning to her Mangere home.
Coroner Garry Evans asked why she did not go back sooner, or phone home to find out what was happening, saying it appeared to be extraordinary.
"I guess I expected Chris to know and deal with the situation from our personal experience with nurses and doctors," she said.
"I can only, I did not know how severe that was. I simply didn't think that it was that bad."
Ms King also today defended why she had told two female police officers she didn't want to speak to them on the day she first took the twins to hospital with critical injuries.
She said that she had been at the hospital for 15 minutes and was emotional as she had been informed the twins were gravely ill.
"I cannot describe the things I was feeling at the time, what thoughts were going through my head," she told Mr Evans.
"I was in no way in a reasonable state to be able to speak with them, let alone explain what happened to my sons."
When it was put to her by Mr Wilkinson-Smith that she had something to hide, Ms King said she still found it hard to speak about the incident.
Ms King yesterday denied she caused the injuries which led to the babies' death.
